The sometimes contentious Aussie has found a comfortable home at Erebus and is now an established top three finisher, while the likes of seven-time Supercars champion Whincup is having his longest winless streak since joining Triple Eight in 2006.
"It's taken us a while to really get going," Reynolds told the Weekend Herald. "We've basically had the same core group of guys for a couple of years now and we've got a lot of passion that makes all the difference.
"Every time we go racing, we learn a lot and get better after each round — it's like a compounding interest effect. The week before Winton, we had a test day and sorted out a lot of issues."
The secret to his and the team's success this season seems to be not caring about what other teams are up to up and down pit lane. Erebus and Reynolds remain focused on doing the best they can with the resources they've got.
"We understand the Mustangs are very fast but we're concentrating on what we're doing and not them, or you'll lose focus on what we have to do and what our goals are.
"We just want to be the fastest Holden and that's usually good enough to be around the top five. You just have deal with what you're given.
"Teams like Red Bull aim to win and sometimes that's just not possible. We take each race weekend as it comes and the Mustangs won't get it right every round, and if we do, we'll be in a position to go for the win."
Whincup may be struggling by his standards but he will be looking forward to the championship's resumption in Townsville, with races today and tomorrow. He's the most successful driver at Townsville, having won 10 races on the street course.
The track has a reputation of biting hard when a mistake is made and there has yet to be a 100 per cent finishing rate.
Reynolds likes the place and can't wait to get stuck in.
"I like Townsville, it's a great track. We've had a few weeks off and I'm keen to get back in the car. Townsville is generally dominated by Triple Eight, so they're going to be tough to beat, as are DJR Team Penske.
"If we can mix it up with them, we'll have done a good job," said Reynolds.